It's defined in UnaryRecursiveAggregate of aggcat.spad:
last : (%, NonNegativeInteger) -> %
++ last(u, n) returns a copy of the last n (\spad{n >= 0}) nodes of u.
++ Note: \spad{last(u, n)} is a list of n elements.
However, I think this signature is more suitable for tail,
after all, we already have:
last : D -> D1 from D if D has URAGG(D1) and D1 has TYPE
tail : D -> D from D if D has URAGG(D1) and D1 has TYPE
So the reasonable extension is last(a,n) returns the nth last
element and tail(a,n) returns the list of last n elements.
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